Unloading valve

Abstract

This invention provides an unloading valve, comprising: a valve body having a first cavity, a second cavity, and a third cavity sequentially arranged and connected internally; an inlet communicating with the second cavity, an unloading port communicating with the first cavity, and an outlet communicating with the third cavity; a pilot valve core movably disposed within the third cavity; a first guide sleeve disposed within the first cavity; the unloading valve core movably disposed within the first guide sleeve and having an unloading position connecting the inlet and the unloading port and a second shut-off position disconnecting the inlet and the unloading port; and a flow guide sleeve disposed within the first cavity and connected to the first guide sleeve, the flow guide sleeve having an inlet communicating with the second cavity and an outlet communicating with the unloading port. The technical solution of this application effectively solves the problem of high production costs caused by high requirements for the machining accuracy of the guide seat in related technologies.

Description

Technical Field

[0001] This invention relates to the field of valve bodies, and more specifically, to an unloading valve. Background Technology

[0002] In related technologies, hydraulic supports are the actuating elements for the support of fully mechanized mining faces, the advancing movement of scraper conveyors, and the advancing movement of coal mining machines. Emulsion pump stations are the power source for hydraulic supports, providing them with initial support force, pushing, pulling, and other hydraulic power. High pressure and high flow rate require reliable emulsion pump station structures. Currently, pump stations both domestically and internationally adopt a reciprocating plunger design. Reciprocating plunger pumps are fixed-displacement pumps, meaning their output flow rate is constant at all times. However, the movement of hydraulic supports at the working face is irregular.

[0003] The unloading valve regulates the flow rate of the emulsion pump station to the working face. Specifically, based on the pressure feedback from the working face, the unloading valve selects to unload or load the pressurized liquid output from the pump station. The unloading valve is a crucial component controlling the loading and unloading of the pump station, and its proper functioning directly affects the normal operation of the working face. The unloading valve and its spare parts have always been among the most critical components of the pump station equipment.

[0004] An unloading valve generally includes a valve body, a guide seat housed within the valve body, and a pilot valve core and an unloading valve core housed within the guide seat. The pilot valve core and unloading valve core can move along the guide seat to allow the unloading valve to unload or load. The guide seat is one of the most important components inside the unloading valve. Because the guide seat guides the movement of the pilot valve core and the unloading valve core, high precision is required in its machining, resulting in high production costs. Summary of the Invention

[0005] The main objective of this invention is to provide an unloading valve that addresses the problem of high production costs caused by the high precision requirements for the guide seat in related technologies.

[0006] To achieve the above objectives, the present invention provides an unloading valve, comprising: a valve body having a first cavity, a second cavity, and a third cavity arranged and connected sequentially inside the valve body; an inlet communicating with the second cavity, an unloading port communicating with the first cavity, and an outlet communicating with the third cavity; a pilot valve core movably disposed in the third cavity and having a connecting position for connecting the inlet and the outlet and a first shut-off position for disconnecting the inlet and the outlet; a first guide sleeve disposed in the first cavity; an unloading valve core movably disposed in the first guide sleeve and having an unloading position for connecting the inlet and the outlet and a second shut-off position for disconnecting the inlet and the outlet; and a flow guide sleeve disposed in the first cavity and connected to the first guide sleeve, having an inlet and an outlet, the inlet communicating with the second cavity and the outlet communicating with the unloading port; when the unloading valve core is in the second shut-off position, the unloading valve core blocks the inlet; when the unloading valve core is in the unloading position, the unloading valve core avoids the inlet.

[0007] Furthermore, the export includes a first sub-export and a second sub-export, wherein the first sub-export is directly opposite the unloading port.

[0008] Furthermore, the unloading valve also includes a first positioning element disposed between the valve body and the first guide sleeve, and a second positioning element connected between the first guide sleeve and the flow guide sleeve.

[0009] Furthermore, the first guide sleeve is provided with a first positioning groove, the valve body is provided with a second positioning groove, the first positioning element is a positioning screw inserted into the first positioning groove and the second positioning groove, the center line L1 of the first positioning groove is located in the center plane of the first sub-outlet, and the center line L2 of the second positioning groove is located in the center plane of the unloading port.

[0010] Furthermore, the first positioning groove is a long groove with a semi-circular cross-section, and the second positioning groove is a long groove with a semi-circular cross-section. The radius of the cross-section of the first positioning groove is equal to the radius of the cross-section of the second positioning groove.

[0011] Furthermore, a first annular recess is provided on the cavity wall of the first cavity. The first annular recess is located on the outer periphery of the guide sleeve and is connected to the first sub-outlet, the second sub-outlet, and the unloading port.

[0012] Furthermore, the first end of the unloading valve core is located inside the guide sleeve, and a second annular recess is provided on the outer wall of the first end of the unloading valve core.

[0013] Furthermore, the radial cross-section of the second annular recess is arc-shaped.

[0014] Furthermore, the end of the unloading valve core furthest from the second cavity is the second end of the unloading valve core, and a cavity structure is provided on the end face of the second end of the unloading valve core.

[0015] Furthermore, the unloading valve also includes a second guide sleeve disposed in the third cavity, and the pilot valve core is movably disposed in the second guide sleeve.

[0016] By applying the technical solution of this invention, the first guide sleeve and the flow guide sleeve are configured as separate structures, both of which are located within the first cavity. Unloading or loading is achieved by blocking or avoiding the inlet on the flow guide sleeve using the unloading valve core. This configuration allows for smaller lengths of both the first guide sleeve and the flow guide sleeve, facilitating their manufacturing and achieving the required precision at a lower cost. Furthermore, during the use of the unloading valve, the first guide sleeve or the flow guide sleeve can be repaired or replaced individually, further reducing the usage, maintenance, or upgrade costs of the unloading valve. Therefore, the technical solution of this application effectively solves the problem of high production costs caused by the high precision requirements for the guide seat in related technologies. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A cross-sectional schematic diagram of an embodiment of the unloading valve according to the present invention is shown;

[0019] Figure 2 It shows Figure 1 Enlarged view of part of the structure of the unloading valve;

[0020] Figure 3 It shows Figure 1 The main view of the unloading valve core of the unloading valve;

[0021] Figure 4 It shows Figure 1 A cross-sectional schematic diagram of the flow guide sleeve of the unloading valve;

[0022] Figure 5 It shows Figure 1 A cross-sectional view of the unloading valve's guide sleeve from another angle;

[0023] Figure 6 It shows Figure 1 A cross-sectional schematic diagram of the first guide sleeve of the unloading valve;

[0024] Figure 7 It shows Figure 1 A top view of the first guide sleeve of the unloading valve; and

[0025] Figure 8 It shows Figure 1 A cross-sectional view of the valve cover of the unloading valve.

[0026] The above figures include the following reference numerals:

[0027] 10. Valve body; 11. First cavity; 111. First annular recess; 12. Second cavity; 13. Third cavity; 14. Inlet; 15. Unloading port; 16. Outlet; 20. Pilot valve core; 30. First guide sleeve; 31. First positioning groove; 40. Unloading valve core; 41. Second annular recess; 42. Cavity structure; 43. Connecting hole; 50. Flow guide sleeve; 51. Inlet; 52. Outlet; 521. First sub-outlet; 522. Second sub-outlet; 61. First positioning element; 62. Second positioning element; 70. Second guide sleeve; 80. Valve cover; 81. Flow channel; 91. First sealing ring; 92. Second sealing ring; 93. Third sealing ring; 94. Fourth sealing ring. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0031] like Figure 1 and Figure 2 As shown, the unloading valve in this embodiment includes: a valve body 10, a pilot valve core 20, a first guide sleeve 30, an unloading valve core 40, and a flow guide sleeve 50. The valve body 10 has a first cavity 11, a second cavity 12, and a third cavity 13 arranged and connected sequentially. The valve body 10 has an inlet 14 communicating with the second cavity 12, an unloading port 15 communicating with the first cavity 11, and an outlet 16 communicating with the third cavity 13. The pilot valve core 20 is movably disposed within the third cavity 13 and has a connecting position for connecting the inlet 14 and the outlet 16 and a first closing position for disconnecting the inlet 14 and the outlet 16. The first guide sleeve 30 is disposed within the first cavity 11. The unloading valve core 40 can... The first guide sleeve 30 is movably disposed within the first guide sleeve 30 and has an unloading position that connects the inlet 14 and the unloading port 15 and a second cut-off position that disconnects the inlet 14 and the unloading port 15; the guide sleeve 50 is disposed within the first cavity 11 and connected to the first guide sleeve 30, and the guide sleeve 50 is provided with an inlet 51 and an outlet 52. The inlet 51 is connected to the second cavity 12, and the outlet 52 is connected to the unloading port 15. When the unloading valve core 40 is in the second cut-off position, the unloading valve core 40 blocks the inlet 51. When the unloading valve core 40 is in the unloading position, the unloading valve core 40 avoids the inlet 51.

[0032] By applying the technical solution of this embodiment, the first guide sleeve 30 and the flow guide sleeve 50 are configured as separate structures, and both the first guide sleeve 30 and the flow guide sleeve 50 are disposed within the first cavity 11. Unloading or loading is achieved by blocking or avoiding the inlet 51 on the flow guide sleeve 50 through the unloading valve core 40. This configuration allows for smaller lengths of both the first guide sleeve 30 and the flow guide sleeve 50, facilitating their manufacturing and achieving the required precision at a lower cost. Furthermore, during the use of the unloading valve, the first guide sleeve 30 or the flow guide sleeve 50 can be repaired or replaced individually, further reducing the cost of using, maintaining, or upgrading the unloading valve. Therefore, the technical solution of this embodiment effectively solves the problem of high production costs caused by high precision requirements for the guide seat in related technologies.

[0033] It should be noted that the working principle of the unloading valve in this embodiment can be found in Chinese invention patent application No. 202111367045.9. The unloading valve 10 in the prior invention patent application is the unloading valve core 40 in this embodiment, and the electromagnetic pilot valve 20 in the prior invention patent application is the pilot valve core 20 in this embodiment.

[0034] During normal production at a fully mechanized mining face, the unloading valve typically operates 18-35 times per minute. This frequent operation, high pressure, and large flow rate pose a severe challenge to the unloading valve. Cavitation on the surfaces of key components of the unloading valve is also a problem that urgently needs to be addressed in related technologies. Specifically, cavitation is a corrosive phenomenon that occurs when a fluid, under high-speed flow and changing pressure conditions, forms cavitation cavities on the metal surface. Continuous cavitation can lead to the formation of large cavities on the metal surface, causing the metal material to fail. The mechanism of cavitation is composed of multiple factors, the most important being the presence of a large amount of gas in the liquid, especially water. Under normal pressure, gas molecules are dispersed in the water. When the pressure drops to the saturated vapor pressure of 5430 Pa, a large number of gas molecules precipitate out, forming cavitation bubbles at the metal-liquid interface, which then develop and collapse. This process generates a large amount of heat, which acts on the metal surface. Based on the mechanism of cavitation, its occurrence is closely related to flow velocity. Reducing the flow velocity and avoiding local static pressures falling below the saturated vapor pressure are key to solving the cavitation problem.

[0035] like Figure 1 , Figure 2 as well as Figures 4 to 7As shown, in this embodiment, outlet 52 includes a first sub-outlet 521 and a second sub-outlet 522, wherein the first sub-outlet 521 is directly opposite to the unloading port 15. The direct alignment of the first sub-outlet 521 with the unloading port 15 allows water to flow directly from the first sub-outlet 521 to the unloading port 15 during unloading, maximizing the effective flow area and preventing excessively high flow velocities at the first sub-outlet 521 and the unloading port 15, which could cause cavitation, affect the normal operation of the unloading valve, or reduce its service life. Specifically, in this embodiment, the first sub-outlet 521 and the unloading port 15 have a uniform circular cross-section, and the cross-sectional radius of the first sub-outlet 521 is smaller than that of the unloading port 15. The phrase "the first sub-outlet 521 is directly opposite to the unloading port 15" means that the centerline L3 of the first sub-outlet 521 is parallel to the centerline L4 of the unloading port 15, and the projection of the first sub-outlet 521 onto the radial cross-section of the unloading port 15 completely falls within the radial cross-section of the unloading port 15.

[0036] Specifically, such as Figure 1 and Figure 2 As shown, the unloading valve also includes a first positioning element 61 disposed between the valve body 10 and the first guide sleeve 30, and a second positioning element 62 connected between the first guide sleeve 30 and the flow guide sleeve 50. The second positioning element 62 achieves circumferential positioning between the first guide sleeve 30 and the flow guide sleeve 50, and the first positioning element 61 achieves positioning between the first guide sleeve 30, the flow guide sleeve 50 and the valve body 10, so that the first sub-outlet 521 can be directly aligned with the unloading port 15, so that the fluid can flow out evenly, and avoid excessively high flow velocity at the first sub-outlet 521 and the unloading port 15, which would cause local pressure to be too low and result in cavitation.

[0037] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the first guide sleeve 30 is provided with a first positioning groove 31, and the valve body 10 is provided with a second positioning groove. The first positioning element 61 is a positioning screw inserted into the first positioning groove 31 and the second positioning groove. The center line L1 of the first positioning groove 31 is located in the center plane of the first sub-outlet 521, and the center line L2 of the second positioning groove is located in the center plane of the unloading port 15. The positioning of the first guide sleeve 30, the flow guide sleeve 50, and the valve body 10 is achieved through the first positioning groove 31, the second positioning groove, and the positioning screw, which has the advantages of simple structure, easy production, and easy assembly. Specifically, the first positioning groove 31 is a long groove with a semi-circular cross-section, and the second positioning groove is a long groove with a semi-circular cross-section. The radius of the cross-section of the first positioning groove 31 is equal to the radius of the cross-section of the second positioning groove.

[0038] It should be noted that the "center plane of the first sub-outlet 521" is the vertical plane where the center line L3 of the first sub-outlet 521 is located, and the "center plane of the unloading port 15" is the vertical plane where the center line L4 of the unloading port 15 is located. This ensures that the center line L1 of the first positioning groove 31 is located within the center plane of the first sub-outlet 521, and the center line L2 of the second positioning groove is located within the center plane of the unloading port 15. This guarantees that after the guide sleeve 50 is installed into the valve body 10, the center plane of the first sub-outlet 521 and the center plane of the unloading port 15 coincide, thereby ensuring that the first sub-outlet 521 is directly opposite the unloading port 15.

[0039] Specifically, in this embodiment, participants Figure 1 , Figure 2 as well as Figures 4 to 7 The guide sleeve 50 has six circular flow ports for liquid discharge. These six circular flow ports are of the same size and are evenly distributed along the circumference of the guide sleeve 50. One of the circular flow ports is the first sub-outlet 521, and the remaining circular flow ports are the second sub-outlets 522. Correspondingly, the annular flange at the upper end of the first guide sleeve 30 has six first positioning grooves 31. The guide sleeve 50 has a circular structure and a connecting boss at its upper end; correspondingly, the lower end of the first guide sleeve 30 has a connecting recess into which the connecting boss can be inserted. A first pin hole is provided on the connecting boss at the position corresponding to the circular flow port (in this solution, three first pin holes are provided, and each first pin hole is located directly above the corresponding circular flow port). A second pin hole is also provided on the outer wall of the connecting recess at the position corresponding to the first positioning groove 31 (in this solution, three second pin holes are provided, and each second pin hole is located directly below the corresponding first positioning groove 31). When the guide sleeve 50 and the first guide sleeve 30 are connected by the pin (i.e. the second positioning member 62), the six circular flow ports and the six first positioning grooves 31 can be matched one by one.

[0040] The unloading port 15 and the second positioning groove are located at opposite ends of the first cavity 11, and the center line L2 of the second positioning groove is located in the center plane of the unloading port 15. When the connected guide sleeve 50 and the first guide sleeve 30 are installed into the valve body 10, the valve body 10 and the first guide sleeve 30 are connected by positioning screws, so that one of the six circular flow ports can be located directly below the second positioning groove. Correspondingly, the circular flow hole (i.e., the first sub-outlet 521) that is opposite to the circular flow port located directly below the second positioning groove can be directly opposite the unloading port 15.

[0041] like Figure 7 As shown, the upper end of the first guide sleeve 30 is provided with three set screw holes to facilitate the assembly and disassembly of the first guide sleeve 30.

[0042] like Figure 1 and Figure 2As shown, a first annular recess 111 is provided on the cavity wall of the first cavity 11. The first annular recess 111 is located on the outer periphery of the guide sleeve 50 and is connected to the first sub-outlet 521, the second sub-outlet 522, and the unloading port 15. In this way, when the unloading valve core 40 is in the unloading position, the water flow can not only flow through the first sub-outlet 521 to the unloading port 15, but also some of the water flow will first flow from the second sub-outlet 522 into the first annular recess 111 and then flow through the first annular recess 111 to the unloading port 15. This can reduce the flow velocity, avoid excessive flow velocity inside the unloading valve, and prevent cavitation.

[0043] like Figures 1 to 3 As shown, the first end of the unloading valve core 40 is disposed inside the guide sleeve 50, and a second annular recess 41 is provided on the outer wall of the first end of the unloading valve core 40. By providing the second annular recess 41 on the outer wall of the first end of the unloading valve core 40, the effective flow area inside the guide sleeve can be increased, the flow velocity can be reduced, and cavitation can be avoided. At the same time, providing the second annular recess 41 on the unloading valve core 40 can reduce the mass of the unloading valve core 40, enabling the unloading valve core 40 to respond quickly.

[0044] like Figures 1 to 3 As shown, the radial cross-section of the second annular recess 41 is arc-shaped. The arc-shaped cross-section makes the lower end of the unloading valve core 40 form a "waist" structure, which has a good flow guiding effect and can reduce the impact of the fluid.

[0045] like Figure 1 and Figure 2 As shown, the end of the unloading valve core 40 furthest from the second cavity 12 is the second end of the unloading valve core 40, and a cavity structure 42 is provided on the end face of the second end of the unloading valve core 40. Providing a cavity structure 42 at the second end of the unloading valve core 40 can further reduce the mass of the unloading valve core 40 and improve its response speed. It should be noted that the aforementioned "cavity structure 42" refers to a recess without any other internal structure; that is, in this embodiment, no spring is provided at the second end of the unloading valve core 40. In related technologies, during the process of the unloading valve core moving from the second cutoff position to the unloading position, the liquid force needs to overcome the elastic force of the spring first, and the conduction area between the outlet and inlet of the guide sleeve cannot quickly reach its maximum, resulting in excessive flow velocity and a tendency for cavitation. In this embodiment, the spring originally located at the second end of the unloading valve core 40 is eliminated. Without having to overcome the elastic force of the spring, the unloading valve core 40 can respond quickly and open in its full stroke. The conduction area between the outlet 52 and the inlet 51 of the guide sleeve can quickly reach its maximum, reducing the possibility of cavitation and greatly extending the service life of the unloading valve.

[0046] Specifically, such as Figure 2As shown, in order to further reduce the mass of the unloading valve core 40 and improve the ease of disassembling and assembling the unloading valve core 40, a connection hole 43 is provided on the bottom surface of the cavity structure 42, which can be connected to the disassembly and assembly tool. The connection hole 43 is provided with an internal thread, which can be threaded to the external thread on the disassembly and assembly tool, so as to facilitate the unloading valve core 40 to be installed into the valve body 10 or removed from the valve body 10.

[0047] like Figure 1 and Figure 2 As shown, in this embodiment, the unloading valve further includes a second guide sleeve 70 disposed within the third cavity 13, and the pilot valve core 20 is movably disposed within the second guide sleeve 70. The second guide sleeve 70 can guide the pilot valve core 20 to control the movement of the unloading valve core 40.

[0048] In this embodiment, the guide seat is divided into a first guide sleeve 30 and a flow guide sleeve 50 disposed in the first cavity 11, and a second guide sleeve 70 disposed in the third cavity 13. The first guide sleeve 30, the flow guide sleeve 50 and the second guide sleeve 70 are processed and assembled separately, which can reduce the processing difficulty and increase the processing precision. Furthermore, during the use of the unloading valve, the first guide sleeve 30, the flow guide sleeve 50 or the second guide sleeve 70 can be repaired or replaced individually, which can further reduce the use, maintenance or upgrade cost of the unloading valve.

[0049] like Figure 8 As shown, the unloading valve also includes a valve cover 80, which has a flow channel 81 communicating with the cavity structure 42. Liquid flowing out from the outlet 16 can communicate with the flow channel 81 on the valve cover 80 through the external flow channel structure. When the pilot valve core 20 is in the open position, the fluid flows directly from the inlet 14 to the outlet, and then flows through the external flow channel structure and the flow channel 81 on the valve cover 80 to the second end of the unloading valve core 40. At this time, both the first and second ends of the unloading valve core 40 are in communication with the fluid. Since the pressure-bearing area of ​​the second end of the unloading valve core 40 is larger, the unloading valve core 40 is pressed against the guide sleeve 50 and remains in the second shut-off position.

[0050] Since the unloading valve in this embodiment operates under high pressure, the sealing between the various components is extremely important. Specifically, for example... Figure 1 and Figure 2As shown, the unloading valve also includes a first sealing ring 91 disposed between the first guide sleeve 30 and the valve cover 80, a second sealing ring 92 disposed between the first guide sleeve 30 and the unloading valve core 40, a third sealing ring 93 disposed between the first guide sleeve 30 and the valve body 10, and a fourth sealing ring 94 disposed between the flow guide sleeve 50 and the valve body 10. These four sealing rings effectively isolate the high-pressure medium. The second sealing ring 92 is a step seal, ensuring both the unloading sealing effect and the smooth movement of the unloading valve core 40 along the first guide sleeve 30. Correspondingly, sealing structures are also provided between the second guide sleeve 70 and the pilot valve core 20, and between the second guide sleeve 70 and the valve body 10.

[0051] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0052] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0053] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0054] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An unloading valve, characterized in that, include: The valve body (10) has a first cavity (11), a second cavity (12) and a third cavity (13) arranged and connected in sequence inside the valve body (10). The valve body (10) is provided with an inlet (14) communicating with the second cavity (12), an unloading port (15) communicating with the first cavity (11) and an outlet (16) communicating with the third cavity (13). The pilot valve core (20) is movably disposed in the third cavity (13) and has a conducting position that connects the liquid inlet (14) and the liquid outlet (16) and a first cut-off position that disconnects the liquid inlet (14) and the liquid outlet (16); The first guide sleeve (30) is disposed inside the first cavity (11); The unloading valve core (40) is movably disposed within the first guide sleeve (30) and has an unloading position that connects the inlet (14) and the unloading port (15) and a second shut-off position that disconnects the inlet (14) and the unloading port (15). A flow guide sleeve (50) is disposed inside the first cavity (11) and connected to the first guide sleeve (30). The flow guide sleeve (50) is provided with an inlet (51) and an outlet (52). The inlet (51) is connected to the second cavity (12), and the outlet (52) is connected to the unloading port (15). When the unloading valve core (40) is in the second cut-off position, the unloading valve core (40) blocks the inlet (51). When the unloading valve core (40) is in the unloading position, the unloading valve core (40) avoids the inlet (51). The outlet (52) includes a first sub-outlet (521) and a second sub-outlet (522), wherein the first sub-outlet (521) is directly opposite the unloading port (15), the center line L3 of the first sub-outlet (521) is parallel to the center line L4 of the unloading port (15), and the projection of the first sub-outlet (521) on the radial section of the unloading port (15) falls completely within the radial section of the unloading port (15); The unloading valve further includes a first positioning element (61) disposed between the valve body (10) and the first guide sleeve (30) and a second positioning element (62) connected between the first guide sleeve (30) and the flow guide sleeve (50). The first guide sleeve (30) is provided with a first positioning groove (31), and the valve body (10) is provided with a second positioning groove. The first positioning element (61) is a positioning screw inserted into the first positioning groove (31) and the second positioning groove. The center line L1 of the first positioning groove (31) is located in the center plane of the first sub-outlet (521), and the center line L2 of the second positioning groove is located in the center plane of the unloading port (15). The center plane of the first sub-outlet (521) is the vertical plane where the center line L3 of the first sub-outlet (521) is located, and the center plane of the unloading port (15) is the vertical plane where the center line L4 of the unloading port (15) is located.

2. The unloading valve according to claim 1, characterized in that, The first positioning groove (31) is a long groove with a semi-circular cross-section, and the second positioning groove is a long groove with a semi-circular cross-section. The radius of the cross-section of the first positioning groove (31) is equal to the radius of the cross-section of the second positioning groove.

3. The unloading valve according to claim 1 or 2, characterized in that, The first cavity (11) has a first annular recess (111) on its cavity wall. The first annular recess (111) is located on the outer periphery of the guide sleeve (50). The first annular recess (111) is connected to the first sub-outlet (521), the second sub-outlet (522) and the unloading port (15).

4. The unloading valve according to claim 1 or 2, characterized in that, The first end of the unloading valve core (40) is disposed inside the flow guide sleeve (50), and a second annular recess (41) is provided on the outer wall of the first end of the unloading valve core (40).

5. The unloading valve according to claim 4, characterized in that, The radial cross-section of the second annular recess (41) is arc-shaped.

6. The unloading valve according to claim 1 or 2, characterized in that, The end of the unloading valve core (40) away from the second cavity (12) is the second end of the unloading valve core (40), and a cavity structure (42) is provided on the end face of the second end of the unloading valve core (40).

7. The unloading valve according to claim 1 or 2, characterized in that, The unloading valve also includes a second guide sleeve (70) disposed in the third cavity (13), and the pilot valve core (20) is movably disposed in the second guide sleeve (70).

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